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Difference between revisions of "EclipseLink/Release/2.5/JPA21"

(Delete Example)
Line 23: Line 23:
  
 
=== Delete Example ===
 
=== Delete Example ===
 +
The folowwing example deletes all the PhoneNumbers that are no longer in service
  
   CriteriaDelete<Customer> q = cb.createCriteriaDelete(Customer.class);
+
   CriteriaDelete<PhoneNumber> q = cb.createCriteriaDelete(PhoneNumber.class);
   Root<Customer> c = q.from(Customer.class);
+
   Root<PhoneNumber> p = q.from(PhoneNumber.class);
   q.where(cb.equal(c.get(Customer_.status), "inactive"),
+
   q.where(cb.equal(p.get(PhoneNumber_.status), "out_of_service"),
  cb.isEmpty(c.get(Customer_.orders)));
+
  
  
 
The following Java Persistence query language delete statement is equivalent.
 
The following Java Persistence query language delete statement is equivalent.
   DELETE FROM Customer c
+
   DELETE FROM PhoneNumber p
     WHERE c.status = 'inactive'
+
     WHERE p.status = 'out_of_service'
    AND c.orders IS EMPTY
+

Revision as of 15:12, 2 May 2013

EclipseLink JPA 2.1

This page contains a summary of the major features supported in EclipseLink that implements the JPA 2.1 (JSR 338) specification requirements. The features and examples on this page do not represent a complete list. For more information, please see: the JSR 338 page.


Bulk Update

Until JPA 2.1, performing deletes or updates was not available using the Criteria API. Through the addition of CriteriaUpdate/CriteriaDelete classes, support for bulkupdate/delete queries has now been added.

Update Example

The following example will update the salary and status, of all Employees who make less than 10000$, and give them a raise.

  CriteriaUpdate<Employee> q = cb.createCriteriaUpdate(Employee.class);
  Root<Employee> emp = q.from(Employee.class);
  .set(e.get(Employee_.salary), cb.prod(e.get(Employee_.salary), 1.1f))
  .set(e.get(Employee_.status), "full_time")
  .where(cb.lt(emp.get(Emploee_.salary), 10000));


The following Java Persistence query language update statement is equivalent.

  UPDATE Employee e SET e.salary = e.salary * 1.1, e.status = "full_time" WHERE e.salary < 10000


Delete Example

The folowwing example deletes all the PhoneNumbers that are no longer in service

  CriteriaDelete<PhoneNumber> q = cb.createCriteriaDelete(PhoneNumber.class);
  Root<PhoneNumber> p = q.from(PhoneNumber.class);
  q.where(cb.equal(p.get(PhoneNumber_.status), "out_of_service"),


The following Java Persistence query language delete statement is equivalent.

  DELETE FROM PhoneNumber p
    WHERE p.status = 'out_of_service'